class Test {
    name() : void {
        console.log("hello world")
    }
}

var obj = new Test()
obj.name();

let words : string = `hahahahaha${obj.name()}123213123`

var str = '1';
var str2:number = <number> <any> str   //str、str2 是 string 类型

let list : number[] = [1,2,3,4,55,6,78]
list.every((val,ids,arr) => {
    return true;
})